As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A STRONG ELECTRICAL BURNING ODOR FILLED THE COCKPIT. DISIPATED WHILE ON OXYGEN. FLIGHT ATTENDANT NOTED THE ODOR AS WELL. PERFORMED ETN-EM-72-034, REMOVED AND REPLACED THE NR 1 PACK RECIRCULATION FAN IAW AMM 21-24-01. OPS CHECKED AIR CONDITIONING DISTRIBUTION SYSTEM IAW AMM 21-20-00. OPS CHECKED GOOD. NO ODOR NOTED.